# Responsive Plus <= 3.5.4 - Authenticated (Contributor+) Stored Cross-Site Scripting via Elementor HTML Widget Import

- **ID:** WPSEC-2026-1436
- **Plugin:** Responsive Starter Templates – Elementor Templates & Starter Sites (`responsive-add-ons`), https://wordpress.org/plugins/responsive-add-ons/
- **Affected versions:** from 2.7.3 before 3.5.5
- **Fixed in:** 3.5.5 (Update to 3.5.5 or later.)
- **Severity:** Medium 6.4 (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N)
- **Weakness:** CWE-79
- **Usage among sites WPSec scans:** plugin Low, affected versions Low (as of 2026-10-22)
- **Attack surface analysis:** https://attacksurface.wpsec.com/plugin/responsive-add-ons
- **Fix released:** 2026-10-21
- **Published:** 2026-10-22
- **URL:** https://wpsec.com/vuln/WPSEC-2026-1436/

## Description

The Responsive Starter Templates plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'responsive-ready-sites-elementor_page_import_process' AJAX action in versions 2.7.3 up to, and including, 3.5.4. This is due to the function saving Elementor data fetched from a URL the user supplies, including HTML widget markup, without checking the unfiltered_html capability or sanitizing the content. This makes it possible for authenticated attackers, with Contributor-level access and above, to inject arbitrary web scripts into pages that execute whenever a user accesses an injected page.

## References

- https://wpsec.com/vuln/WPSEC-2026-1436/
- https://plugins.svn.wordpress.org/responsive-add-ons/tags/3.5.5/
- https://wordpress.org/plugins/responsive-add-ons/

Source: WPSec, https://wpsec.com/vuln/WPSEC-2026-1436/

License: CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). Free to use, share and adapt, also commercially, if you credit WPSec and link to this advisory.